Email not working after upgrade to 3.0.3

I just upgraded to ispconfig 3.0.3 and am having email problems. Any email to the server bounces with:
Recipient address rejected: User unknown in virtual mailbox table (state 17)

In ISPConfig itself everything looks right.

The upgrade did end with an error:
Update finished.
/usr/local/ispconfig/server/scripts/update_from_tgz.sh: line 8: f: command not found
/usr/local/ispconfig/server/scripts/update_from_tgz.sh: line 9: syntax error near unexpected token `then'
/usr/local/ispconfig/server/scripts/update_from_tgz.sh: line 9: `then'

But since it had said Update Finished and everything in ISPConfig looked right, I didn't worry about it.

Now I'm worried.

I attached all the output from the upgrade process. I took the default on all questions it asked ("Reconfigure Services" and whatnot).